Automatic roll-skinning apparatus



Sept. 29, 1925, 1,555,391

.1. E. suRFus AUTOMATIC ROLL SKINNING APPARATUS Filed Feb. 28, 1925 a 2 A TORNEY Patented Sept. 29, 1925.

UNITED; STATES; PAT-Euro FJF 16E, 2:1

JOHN nvnnnrr-snnrnslor OREGON CITY, OREGON; tASSIGNORJOF. iONE-HALF-ZTQ EVA W. SURFUS OFS OREGON CITY, OREGON.

AUTOMATIC noLL-sKINNINe nnmar e Applicationfiled February 28, 1925 ;Ser ia1 No,,12,260,

To allauhom it may con/0mm;

Be it, known that I, JOHN SURFUSYH,

citizenmofwthe United. States, residingat Oregon-City, in the county of Clackamas and State oforegon, haveinvented certain new and, useful Improvements in Automatic Roll-Skinning Apparatus, of which the fol-v lowing is a specification,

The invention has for, its object-to pro vide a'simple and effective means for automaticallyhcutting the lap. of pulp sheets; formedon theflpresser roll ofso-calledflwet In these-wet-machinesl.the pulp sheetis formed onthe upper oneofa pair of upper and lower presser rolls, that roll beingv yer; tically movable in guides so that the ever increasing thickness otthe pulp sheet flocounted for by-the winding on of successive thickness s of the material -may be accommodated'. Under the present method, the roll skinner observes the accumulation ,of

thickness of the pulp v sheet and at the proper i-moment cuts across the same with, the skinning-stick to skin the sheet from the roll on which itis formed.

It is to ,remedy the above mentioned ex: pens veand more ,or less lmpractlcal operation that my invention is addressed and in 7 its moredetailednature :thesaid invention seeks to ,,provide a simple skinning device, pressure actuated, and spring returned, and the functioning of which is controlled by movement of the upper presser roll of the machine to therebyassure thecutting of the lap ofpulpsheetatthe propertime. With view that .willhereinatter. appear the inventionlfurtherc residesinrthose novel de.

tails of construction, combination, and arrangements of parts, first fully described in. V

the following detailed desjcription,.;then particularly, pointed out .in, the appended claims, reference tbeinghad tothe accompanying drawing, in which sheet which is to be skinned from that in the manner and positiondiagrammatis at present. ically illustrated Figure 1 of the draw+ [the aboveand other objects in Figure 1 is a somewhat diagrammatic irontelevation and part section illustrating the application of the invention,

- Figur-eg isvertical crosssection taken on the line- 2 2 on Figure l. F igure 3 is a detail perspective view of t u terfca ying plung rt In the drawing 1- and 2 indicate, the upper and lower press rolls of the pulp or socal-ledvgwet machine, and 3andg thetrunnions thereof respectively,

A cylindrical plungerhousing 5 is mountedabove the-upper press roll 1 upon which the pulp layers accumulateto form the pulp a ing. The housing 5 is hollow to provide a cylindrical, bore or plunger guideway 6 and has the lower portionigof. the wall thereof v slotted throughout; its length as indicated at 7 inFigur'es land 2.

.with an enlarged, portion for providing an enlarged air chamber g rin communication with the plunger guide 6, the purpose for One end .OfQt e ou ng 5, i fp o i ed which will later-appear, and. niairinduction portion9 of substantially the same diameter of-the said guide and which communicates with the said enlarged chamber. A compressed a r line is connected in communicationwith the airportion 9, which. said communication is controlled, by the valve lO-which may be of any approved type i I such asis spring held to a normally closed QQIlClitlOIl.-, ,Tl1L1S it will beunderstood that,

compressed air injection, into the chamber 8 is normally closed off, and it will herein-V after appeanthat meansis provided, controlled by upward movement of the roll l v efiectedby pulp layer ,accumulation,,,ifor so actuating that valve, at the desired moment,

to open. compressed air communication butv momentarily, so that the actual skinning action alone is air pressure efi'ected andnot the resettingof the parts to their normal position in amanner soon to be fdescribed'and whichprovides for a- 1 more efiicient and. economicmanipulationthan has heretofore been possible. 1,

In Figure 1 of the drawing I havediavgrammatically illustrated one simple means of effecting the desired; momentary. valve actuation it being understood that .any 1-;

other suitable means may be employed, and I do not wish to be limited to the employment of the specific means shown.

In the illustration referred to I have shown a Weighted lever 11, pivoted as at 12 in position for being raised to an elevation above the spring extended stem of the valve 10 and. dropped to effect a striking and momentary depression of that stem to momentarily unseat or open the valve, a spring 13 serving to normally hold that lever in the normal position illustrated in the said Figure 1.

For elevating the lever 11 to a suitable elevation and dropping the same onto the valve stem I provide a rod 14 vertically movable in a suitable bearing as indicated, the said rod having at one extremity a rule jointed portion 15 and being connected by the crank and link devices 16 to be moved upwardly with and under the control of one trunnion of the upper press roll 1.

The pulp sheet has been designated 17 A free plunger 18, cylindrical in shape and of a size for more or less snugly-slidably fitting the guide 6, is provided and has secured thereto the skinning knife 19 sharpened to a cutting edge as at 20 and which is so shaped and secured to the plunger as to provide a slot engaging guide fin 21. As indicated in Figures 1 and 2 the knife 19 projects through the longitudinal slotway 7 and engages the upper roll 1 so as to effectively cut the pulp sheet when the moment ary air presure impulse is imparted to the plunger to cause said knife to traverse the said pulp sheet. 7

A cushion spring 22 is positioned in the end of the guide 6 opposite that which communicates with the chamber 8 and that spring may or may not be carried by the guide end closing plug 23 as desired. As before stated the compressed air injection is but momentary and ceases just before the plunger completes its cross travel so that when the plunger 18 does complete such travel and engages the spring 22 it will be caused to rebound to its initial normal position illustrated in Figure 1.

The operation of the invention is as fol lows As the pulp layer accumulation attains the desired thickness to form the pulp sheet the upper press roll 1 will have been lifted thereby an amount equivalent to the thickness of that sheet.

As the upper roll 1 rises, its trunnion 3 engages the first rockable lever of the devices 16 and, through the other lever and link thereof, effects an elevation of the rod connection 14. As the rod 14 rises, its rule jolnted end 15 will engage and lift the free end of the pivoted and weighted lever 11 which, when elevated to the proper height will become disengaged from the end 15 and fall with force upon the valve stem, efiecting a momentary opening of the valve but rebounding to the normal position above the valve stem as indicated in Figure 1 by reason of the provision of the spring 13.

The momentary blast of air will be directed against the free plunger 18 and effect a driving of the knife 19 across the roll 1 to cut the pulp sheet, from the full line position to the dot and dash position indicated in Figure 1.

l/Vhen the plunger 18 reaches the limit of its stroke, as indicated by the dot and dash lines above mentioned, it will have engaged and stored up sufficient energy in the spring 22 to cause it to rebound to the normal position indicated in full lines in the said Figgure 1. 3 f it As the roll 1 descends to the normal lowered position the rod 14 is lowered to its normal position, the rule joint end 15 collapsing to permit passing of the end of the lever 11 and falling to its normal position after passing that lever end.

By reason of providing the quick momentary air blast the pulp sheet is positively cut at the desired moment without variation due to uncertain gear meshing or other controlling transmissions heretofore attempted for the purposes here addressed. Also, by providing the slot 7 and directing the same at the cut the skinning action is greatly facilitated by the air blast.

It will be observed by reference to Figure 1. that the plunger 18, when in its normal at rest position, projects into the chamber 8. The provision of such a chamber will efiectively serve to prevent air cushioning of the plunger such as might tend to discontinue its rebound short of the return to absolute normal. 5

In the foregoing description I have disclosed a simple, practical and efiicient automatic lap cutter, more compact than other devices addressed to the same purpose, and which is automatically operable for efiiciently and uniformly cutting the pulp sheets, thus eliminating the need of the hand employed to skin the rolls by hand, and the structural details of which and the manner of operation will be readily apparent to those skilled in the art to which the invention relates.

What I claim is:

1. In roll skinning mechanism of the class described, a free piston carrying a skinning knife, a guide in which said piston is movable across the roll on which the pulp sheet accumulates for engaging and cutting that sheet, means at one end of said guide for imparting a driving impulse to said piston to propel it in the sheet cutting direction, and means at the other end of said guide for causing a rebound of said piston to its Y normal position.

2. In roll skinning mechanism of the class described, a free piston carrying a skinning knife, a guide in which said piston is movable across the roll on which the pulp sheet accumulates for engaging and cutting that sheet, means for injecting an air blast at one end of said guide for imparting a driving impulse to said piston to propel it in the sheet cutting direction, and a spring device at the other end of said guide for causing a rebound of said piston to its normal positlon.

3. In roll skinning mechanism of the class described, a free piston carrying a skinning knife, a guide in which said piston is'movable across the roll on which the pulp sheet accumulates for engaging and cutting that sheet, means for injecting an air blast at one end of said guide for imparting a driving impulse to said piston to propel it in the sheet cutting direction, and a spring device at the other end of said guide for causing a rebound of said piston to its normal position, said guide being slotted to permit projection of the skinning knife and said slot being directed toward the line of cut of the said knife.

4:. In roll skinning mechanism of the class described, a free piston carrying a skinning knife, a guide in which said piston is movable across the roll on which the pulp sheet accumulates for engaging and cutting that sheet, means for injecting an air blast at one end of said guide for imparting a driving impulse to said piston to propel it in the sheet cutting direction, and a spring device at the other end of said guide for causing a rebound of said piston to its normal position, the said guide having an enlarged portion forming an air chamber into which the plunger projects when in its nor mal position.

5. In combination with the upper and lower press rolls of a pulp machine, one of which is vertically movable relatively to the other and adapted to receive accumulating layers of pulp; a free piston carrying a skinning knife, a guide in which said piston is movable across the roll on which the pulp sheet accumulates for engaging and cutting that sheet, means for injecting an air blast at one end of said guide for imparting a driving impulse to said piston to propel it in the sheet cutting direction, and a spring device at the other end of said guide for causing a rebound of said piston to its normal position, the said air blast injecting means including a control valve and means actuated by and at a predetermined moment of the upward travel of the movable press roll for momentarily opening said valve. JOHN EVERETT SURFUS. 

